<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>随鼠标移动的小球</title>
    <script src="https://unpkg.com/vue@next"></script>
    <style>
        body {
            margin: 0;
            padding: 0;
        }
        .container {
            margin: 0;
            padding: 0;
            position: absolute;
            width: 440px;
            height: 440px;
            background-color: blanchedalmond;
            display: inline;
        }
        .ball {
            position: absolute;
            width: 60px;
            height: 60px;
            left: 100px;
            top: 100px;
            background-color: red;
            border-radius: 30px;
            z-index: 100s;
        }
    </style>
  </head>
  <body>
    
    <div id="Application">
        <div class="container" @mousemove.stop="move">
            <div class="ball" :style="{left: offsetX + 'px', top:offsetY + 'px' }">
            </div>
        </div>
    </div>

  </body>

  <script>
    const App= {
      data(){
        return {
          offsetX:0,
          offsetY:0
        }
      },
      methods: {
        move(event){
            if(event.clientX + 30 > 440){
                this.offsetX = 440-60
            }else if(event.clientX - 30 < 0){
                this.offsetX = 0
            }else{
                this.offsetX =  event.clientX - 30
            }

            if(event.clientY + 30 > 440){
                this.offsetY = 440-60
            }else if(event.clientY - 30 < 0){
                this.offsetY = 0
            }else{
                this.offsetY =  event.clientY - 30
            }
        }
      }
    }
    Vue.createApp(App).mount("#Application")
  </script>

</html>